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Optical high-rate pulse position modulation scheme and optical communications system based thereon

a pulse position and modulation scheme technology, applied in the field of pulse position modulation scheme and optical communication system, to achieve the effect of facilitating the increase of raw data rate and higher data ra

Inactive Publication Date: 2011-12-20
OERLIKON SPACE
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a communication system that can communicate between two remote terminals even at long distances and low signal-to-noise ratios. The system uses optical terminals with power Laser sources to emit optical signals. The received optical power is converted into an electrical current, which is then used to demodulate the information signal. The system also uses a novel Pulse Position Modulation (PPM) scheme to increase the raw data rate and allow for more data to be conveyed through obstructed optical channels. This results in higher data rates than can be achieved with On-Off-Keying (OOK)."

Problems solved by technology

RF technologies just go with a linear increase in electrical signal power when increasing a RF signal pulse peak power into a narrower slot, resulting in no SNR gain, because electrical noise power increases by the same amount due to the higher bandwidth needed.

Method used

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  • Optical high-rate pulse position modulation scheme and optical communications system based thereon
  • Optical high-rate pulse position modulation scheme and optical communications system based thereon
  • Optical high-rate pulse position modulation scheme and optical communications system based thereon

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Embodiments

[0054]The basic functions of the present invention are now described in the context of a first embodiment. This embodiment of the Laser communication system is schematically illustrated in FIG. 8. As it can be seen on this figure, the Laser communications system 10 comprises a first transceiver 20 and a second transceiver 30 for establishing two optical channels A, B there between.

[0055]Further details of the Laser communication system can be seen on FIG. 9. According to the present invention, the first transceiver 20 comprises a first transmitter T1 with a Laser light source 22 for transmitting optical pulse position modulated signals encoded by the encoder 29 into a first of said optical channels A and further comprising a receiver R1 for receiving the PPM symbols, a photon detector 35 such as a photo diode, a PPM demodulator and a PPM detector 40. FIG. 9 also shows the second transceiver 30 as comprising a second transmitter T2 with a Laser light source 22′ for transmi...

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Abstract

It is an object of the present invention to provide a communications system for communication between two remote terminals, where even at very long distances between these two terminals and / or at very small signal-to-noise ratios a robust communication is possible. The invention achieves the goal set before by suggesting an inventive pulse position modulation scheme and a corresponding optical communications system. The system and method according to the invention are very well suited for communication with a satellite in deep space, for instance.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application claims the priority of the European patent application no. 07 101 803.0 filed 6 Feb. 2007.FIELD OF THE INVENTION[0002]The present invention concerns a pulse position modulation scheme and optical communications systems. The system and method presented herein are very well suited for communication with a satellite in deep space, for instance.BACKGROUND OF THE INVENTION[0003]So far mainly radio frequency (RF) links are used in order to provide for a communication between a ground station and a terminal carried by a satellite in deep space. In such communications systems typically one terminal is attached to the satellite whereas another terminal is either a ground based terminal or a terminal carried aboard of a second satellite in an orbit closer to the earth.[0004]Various researchers and developers, however, are currently developing optical links to support deep-space communication to satellites.[0005]The longer the...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B10/04H04B10/118H04B10/43
CPCH04B14/026H04L25/4902H04L25/4917
Inventor TUCHLER, MICHAEL
Owner OERLIKON SPACE
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